Presidential primaries and caucuses were organized by the Democratic Party to select the 3,979 pledged delegates to the 2020 Democratic National Convention held on August 17–20 to determine the party's nominee for president in the 2020 United States presidential election.
Trần Nhân Tông (1258–1308) was the third monarch of the Trần dynasty, reigning over Đại Việt from 1278. During the second and third Mongol invasions of Đại Việt between 1284 and 1288, Nhân Tông and his father the retired emperor Trần Thánh Tông achieved a decisive victory against the Yuan dynasty.
The empty string should not be confused with the empty language ∅, which is a formal language (i.e. a set of strings) that contains no strings, not even the empty string. The empty string has several properties: |ε| = 0. Its string length is zero. ε ⋅ s = s ⋅ ε = s. The empty string is the identity element of the concatenation operation
Date: November 4, 2020 – April 11, 2021 (5 months and 1 week) Caused by: False claims of electoral fraud made by Donald Trump; Goals: Overturn 2020 presidential election results
According to World Bank, gross national income per capita in Puerto Rico in 2020 was $21,740. Puerto Rico's economy is mainly driven by manufacturing (primarily pharmaceuticals, textiles, petrochemicals and electronics) followed by services (primarily finance, insurance, real estate and tourism); agriculture represents less than 1% of GNP.
The 2020 United States presidential election was the 59th quadrennial presidential election, held on Tuesday, November 3, 2020. [a] The Democratic ticket of former vice president Joe Biden and the junior U.S. senator from California Kamala Harris defeated the incumbent Republican president Donald Trump and incumbent vice president Mike Pence . 
Harry S. Truman (May 8, 1884 – December 26, 1972) was the 33rd president of the United States, serving from 1945 to 1953.A leader of the Democratic Party, he previously served as the 34th vice president from January to April 1945 under Franklin Roosevelt and as a United States senator from Missouri from 1935 to January 1945.